Waves 1
What type of wave does not need a medium to travel through?
Electromagnetic
What is a medium?
Any matter that a wave can travel through
Where do you measure the wavelength of a transverse wave
crest to crest or trough to trough
What is a wave?
An disturbance in a space.
A transfer of energy
What do waves transmit?
Energy
What is the frequency of a wave that has 5 waves pass by a certain point in 12 seconds?
2.4 hertz
What is the frequency of a wave that has had 15 waves pass by in 15 seconds
1 hertz
What happens when light hits a mirror and what is this called?
The light waves bounce off
Reflection
Where do yo measure the amplitude of a wave?
Fromt he mid line to the crest of mid line to the trough
CPR What is the first thing you do when you see that someone needs help?
Check the scene for safety
CPR At what rate do you give compressions?
100-120 a minute
CPR What do you do if a choking person you are helping becomes unresponsive?
Slowly lay them on the ground and begin cpr
What is the ratio of compressions to breaths if you are giving breaths
30:2
When you see a child that needs CPR but no one is around to help, what do you do
You do CPR for five cycles of 30 compressions to 2 breaths. If no one has come then you go get help.
If a wave is entering a bay where it has to go through a small opening what is going to happen and what is this called?
It bends around the openeing or obstacles in its path.
Diffraction
If I have two waves coming together and the crest and trough are opposite what is going to happen and what is this called?
They are going to becoe smaller or cancel eachother out.
Destructive interference
What would happen to the wavelength of a wave if you increased the frequency, what would happen if you decreased the frequency?
It would become shorter
It would become longer
If I have two waves coming together and the crest and trough line up what is going to happen and what is this called?
They are going to build on each other creating a larger wave
Construstructive interference
Why if you are under water you can hear sounds from farther away than you could if you are out of the water?
Sound waves travel through vibrations. In water the molecules are closer together so the vibrate eachother more quickly than in the air.
What effect do you think speed has on the doppler effect? Explain your reasoning for the effect?
The faster you go the more the waves will compress and the more they will spread out. The faster the object is moving the more of a frequency shift there will be both higher and lower
Compare a beam of red light to a beam of violet light. If the violet light has a much shorter wavelength than the red light, explain how their frequencies will differ?
The red light has a much lower frequency than that of the violet light
What type of wave is a sound wave, does it have to have a medium to travel through, if it does why does it have to have a medium?
Longitudinal
Yes
The waves moves by vibrating matter. If it does not have matter it cannot vibrate
"A coastal city is designing a new sea wall to protect its harbor from large storm waves. One engineer proposes doubling the height of the wall (the amplitude it can withstand), while another engineer argues that they should focus on a wall that can break up the frequency of the incoming waves. Which engineer should they go with and why.
The taller wall. The higher the amplitude the higher the energy of the wave.
If I am standing still and a siren is approaching me, then passing by me, why does it sound higher as it approaches and lower after it passes by?
As teh siren approaches you the waves compress casuing it to become a higher frequency to you and after it passes by the waves become more spread out casuing it to shift to a lower frequency according to you the observer.
A student notices that a straw in a glass of water appears broken at the water's surface. (Part A) Identify the scientific phenomenon occurring and (Part B) explain how the change in the speed of light causes this visual effect.
Refraction
As the light enters a new medium it slows down a little bit casuing the light waves to bend and appear to be oin a different place